Gear motor having safety mechanism

Abstract

A gear motor having a safety mechanism includes a motor body, a speed reduction mechanism, a transmission mechanism, and a touch switch. The speed reduction mechanism includes a worm and a worm wheel drivingly engaged with the worm. The transmission mechanism includes a base fixed to the speed reduction mechanism, a lead screw rod pivotally connected to the base and rotatably driven by the worm wheel, and a nut threadedly connected to the lead screw rod. The touch switch is electrically connected to the motor body and provided aside the lead screw rod, thereby stopping the motor body when the nut contacts the touch switch. Thus, the gear motor not only controls the operation of the driven mechanism, but also allows various driven mechanisms to be mounted thereon. The assembled volume of the gear motor and the driven mechanism is reduced.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an actuator, and in particular to a gear motor having a safety mechanism.[0003]2. Description of Prior Art[0004]A transmission mechanism is widely used in various apparatuses such as electric sickbeds, treadmills, electric tables or the like for adjusting their height or inclination angle. The starting point and the terminal point of the stroke of the transmission mechanism are often provided with a touch switch respectively. When the transmission mechanism moves along its stroke and contacts the touch switch provided at the starting point or the terminal point, the touch switch will shut off the electricity supplied to the transmission mechanism, so that the transmission mechanism can stop operating at the terminal point or the starting point. In this way, the transmission mechanism can be prevented from idling or wearing at the starting point or the terminal point, thereby increasing t...

AI Technical Summary

Benefits of technology

The invention is a gear motor with a safety mechanism. It includes a motor body, a speed reduction mechanism, a transmission mechanism, and a touch switch. By using the touch switch, the motor can control the operation of the driven mechanism and other mechanisms can be mounted on it. This arrangement reduces the size of the gear motor and driven mechanism assembly. The touch switch is positioned to correspond to the travel of the nut, stopping the motor when the nut touches the switch. The rotation of the adjustable screw rod can adjust the position of the touch switch and the maximum number of rotations of the lead screw rod, improving safety and ease of inspection and adjustment. The invention also prevents the driven mechanism from operating continuously at the terminal points, increasing safety and reducing wear and tear. It allows for various driven mechanisms to be mounted on the gear motor, reducing stock levels and assembly costs. The touch switch position and lead screw rod design reduces the assembled volume of the gear motor and driven mechanism assembly.

Problems solved by technology

However, in practice, the above linear actuator still has following problems.

Thus, the manufacturers in this field have to prepare various combinations of the driven mechanisms 30 and touch switches, which increases the stocks and the difficulty in managing inventory.

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